Failure Code [Dx20Ky] Clutch Epc Solenoid: Hot Short - Komatsu WA250-6 Shop Manual

SEN03847-00

Failure code [DX20KY] Clutch EPC solenoid: Hot short

Action code Failure code
E03 DX20KY
Contents of
• Hot short was detected in clutch EPC solenoid circuit.
trouble
• Turns clutch EPC solenoid output OFF.
• Turns motor 1 solenoid output OFF.
Action of
• Turns HST safety relay output OFF.
controller
• Even if trouble disappears, system does not reset itself until starting switch is turned OFF.
• Turns the centralized warning lamp and alarm buzzer ON.
• Traction force is decreased.
Problem that
• Travel speed is not limited with speed range selector switch and travel speed control dial.
appears on
• If engine is stopped without applying parking brake securely on slope, machine moves down sud-
machine
denly.
• Following output command values can be checked with monitoring function.
Motor 1 solenoid output: HST – 80000 – MOTOR SOL DIR (mA)
Related HST safety relay output: HST – 40979 – D_OUT_15 (ON/OFF)
information Clutch EPC solenoid output: HST – 80100 – CLUTCH SOL DIR (mA)
• [DX19KA], [DX19KY] or [DX20KA] may be also displayed, depending on condition when error was
detected.
Defective clutch EPC sole-
1
noid (Internal defect)
Possible causes
and standard
value in normal
state
Hot short (Contact with 24V
2
circuit) in wiring harness
3 Defective HST controller
16
40-370
Clutch EPC solenoid: Hot short
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between wiring harness HST (female) (9) –
T05 (female) (1) and ground
Between wiring harness L111 (female) (3) –
T05 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting
(Troubleshoot with traction switch OFF and machine is stopped (do
not travel))
Between wiring harness HST (female) (9) –
T05 (female) (1) and ground
• If causes 1 – 2 are not detected, HST controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
370 Troubleshooting by failure code (Display of code), Part 7
Failure code [DX20KY] Clutch EPC solenoid: Hot short
Standard value in normal state/Remarks on troubleshooting
T05 (male)
Between (1) – (2)
Between (1), (2) – ground
1
Resistance
5 – 15 z
Min. 1 Mz
Voltage Max. 1 V
Voltage Max. 1 V
Voltage 10 – 15 V
WA250, 250PZ-6